Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Date:
1914
Author:
Gage, Simon Henry, 1851-1946
Publisher:
Ithaca, N.Y. : Comstock Publishing Co.
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Leaf #:
000480
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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CH. XII] BRIGHTNESS OF SCREENS 465 details should be plainly visible when the slide is 30 cm. in front of the eyes, and therefore are plainly visible in the screen image as far back as the lantern. FIG. 250. DISTRIBUTION OF BRIGHTNESS OF TRANSLUCENT AND REFLECTING SCREENS WHEN SEEN FROM DIFFERENT DIRECTIONS Reflected Light from Magnesium Oxide and Mirror Screen. Light Transmitted through Ground Glass. Note that the mirror screen when seen perpendicularly reflects 7 times as much light as does magnesium oxide, and ground-glass 19 times as much. But this great brightness of the mirror screen and the ground-glass is limited to a very narrow angle, while the white magnesium oxide reflects nearly equally throughout the entire hemisphere. Brightness of MgO is taken as unity and the figures on the radius indicate the number of times brighter the screen appears than this.